Question

我正在尝试创建一个简单的网站。现在，我最大的目标是测试我的DI方法，看看一切是否正常，但是我遇到了这个错误

尝试激活“ Data.Services.VehicleService”时，无法解析类型为“ System.Linq.IQueryable`1 [Data.Entities.VehicleMakeEntity]”的服务。

这是VehicleMakeEntity类

    public class VehicleMakeEntity
{
    public int Id { get; set; }

    public string Name { get; set; }

    public string Abrv { get; set; }

    public List<VehicleModelEntity> Models { get; set; }
}

VehicleService类中的方法

        public IEnumerable<VehicleMakeEntity> GetMake(int index, int count, Expression<Func<VehicleMakeEntity, int>> orderLambda)
    {
        var data = _makeRepository.SelectListMake(index, count, orderLambda).AsQueryable();
        return data;
    }

存储库类中的方法

           private readonly IQueryable<VehicleMakeEntity> source;
        public IEnumerable<VehicleMakeEntity> SelectListMake(int index, int count, Expression<Func<VehicleMakeEntity, int>> orderLambda)
    {
        return source.Skip(index * count).Take(count).OrderBy(orderLambda).AsQueryable();
    }

我在DI容器中添加服务的方式

            services.AddScoped<IModelRepository, ModelRepository>();

        services.AddScoped<IMakeRepository, MakeRepository>();

        services.AddSingleton<IVehicleService, VehicleService>();

我要测试的是该方法是否有效，所以在控制器中我有这个

    public class HomeController : Controller
{
    IVehicleService _vehicleService;

    public HomeController(IVehicleService vehicleService)
    {
        _vehicleService = vehicleService;
    }

    public IActionResult Index()
    {
        var data = _vehicleService.GetMake(3, 2, (p => p.Id));

        return View();
    }

我找不到导致IQueryable错误的原因。

编辑：

这是服务构造函数

        public VehicleService(IMakeRepository makeRepository, IModelRepository modelRepository, ProjectDbContext context)
    {
        _makeRepository = makeRepository;
        _modelRepository = modelRepository;
    }

我不小心在此处留下了IQueryable参数，这就是错误的原因。现在我得到了这个错误

无法使用单例“ Data.Interfaces.IVehicleService”中的作用域服务“ Data.Interfaces.IMakeRepository”。

IMakeRepository

    public interface IMakeRepository : IDisposable
{
    void Insert(VehicleMakeEntity entity);

    void Update(VehicleMakeEntity entity);

    void Delete(VehicleMakeEntity entity);

    IEnumerable<VehicleMakeEntity> SelectListMake(int index, int count, Expression<Func<VehicleMakeEntity, int>> orderLambda);
}

IVehicleService

    public interface IVehicleService
{
    IEnumerable<VehicleMakeEntity> GetMake(int index, int count, Expression<Func<VehicleMakeEntity, int>> orderLambda);

    IEnumerable<VehicleModelEntity> GetModel(int index, int count, Expression<Func<VehicleModelEntity, int>> orderLambda);
}

尝试激活服务时实体上的IQueryable错误

0 个答案: